btlocks.c

/* -*- Mode: C++; c-basic-offset: 4 -*- *//* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is the Netscape Portable Runtime (NSPR). * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998-2000 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** *//*** File: btlocks.c** Description: Implemenation for thread locks using bthreads** Exports: prlock.h*/#include "primpl.h"#include <string.h>#include <sys/time.h>void
_PR_InitLocks (void)
{
}
PR_IMPLEMENT(PRLock*)
PR_NewLock (void)
{
PRLock *lock;
status_t semresult;
if (!_pr_initialized) _PR_ImplicitInitialization();
lock = PR_NEWZAP(PRLock);
if (lock != NULL) {
lock->benaphoreCount = 0;
lock->semaphoreID = create_sem( 0, "nsprLockSem" );
if( lock->semaphoreID < B_NO_ERROR ) {
PR_DELETE( lock );
lock = NULL;
}
}
return lock;
}
PR_IMPLEMENT(void)
PR_DestroyLock (PRLock* lock)
{
status_t result;
PR_ASSERT(NULL != lock);
result = delete_sem(lock->semaphoreID);
PR_ASSERT(result == B_NO_ERROR);
PR_DELETE(lock);
}
PR_IMPLEMENT(void)
PR_Lock (PRLock* lock)
{
PR_ASSERT(lock != NULL);
if( atomic_add( &lock->benaphoreCount, 1 ) > 0 ) {
if( acquire_sem(lock->semaphoreID ) != B_NO_ERROR ) {
atomic_add( &lock->benaphoreCount, -1 );
return;
}
}
lock->owner = find_thread( NULL );
}
PR_IMPLEMENT(PRStatus)
PR_Unlock (PRLock* lock)
{
PR_ASSERT(lock != NULL);
lock->owner = NULL;
if( atomic_add( &lock->benaphoreCount, -1 ) > 1 ) {
release_sem( lock->semaphoreID );
}
return PR_SUCCESS;
}